Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60fbbdae81eec51…

MALICIOUS

PDF

31.7 KB Authoring application: LibreOffice Draw
MD5: dd5b0101fc18daa16f32b6c42147c865 SHA-1: ba0e7c4c8f8b7a52fc3183297a6e612199c776e0 SHA-256: c60fbbdae81eec516934bb1fc671a8d0eded7816632898ed3f1e329cd4c45c44
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded URLs pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as suggested by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this file as malicious. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://priorlakestorage.com/uploads/1/3/0/6/130605422/4261167.pdf
    • http://kwhitewc.com/uploads/1/3/0/3/130313166/wufesita-litazanuwijubon-pavuxarefas.pdf
    • http://kurzyhs.info/uploads/1/3/0/6/130605472/1563307.pdf
    • http://anotherj.com/uploads/1/3/0/5/130551095/7609352.pdf
    • http://pensacolaaudiodocumentation.com/uploads/1/3/0/5/130545098/kiponurefoxoj.pdf
    • http://mitchellwenkus.com/uploads/1/3/0/5/130588289/2076099.pdf
    • http://downforacure.org/uploads/1/3/0/6/130639256/8774926.pdf
    • http://wabashtees.com/uploads/1/3/0/5/130589391/3705906.pdf
    • http://seviru.mywayinternational.net/uploads/2020/01/29/tibulutorusibiw_musef_molezedubogi.pdf
    • http://leclfr.com/uploads/1/3/0/4/130436079/voduzuna.pdf
    • http://myroyalorganics.com/uploads/1/3/0/6/130621495/e1600e748b8.pdf
    • http://southernstylestudioandmore.com/uploads/1/3/0/6/130621703/binojavudile.pdf
    • http://rootedsunshinetraining.com/uploads/1/3/0/2/130273814/130273814.html#solved+problems+in+functional+analysis+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001337.bin
2963455a55a7560f8f0dd4152e2258498024b407e369a5d04a5414d622c8f5dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1337 8156 bytes

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